@Entity( name = "Person" )
	@Table( name = "persons" )
	public static class Person {
		@Id
		private Integer id;

		private String name;

		@OneToMany( cascade = CascadeType.ALL, mappedBy = "owner" )
		private List<Cat> cats = new ArrayList<>();
	}

	@Entity( name = "Mammal" )
	@Table( name = "mammals" )
	@Inheritance( strategy = InheritanceType.JOINED )
	public static class Mammal {
		@Id
		private Integer id;

		private String name;

		@ManyToOne
		@JoinColumn( unique = true )
		private Person owner;
	}

	@Entity( name = "Cat" )
	@Table( name = "cats" )
	public static class Cat extends Mammal {
		private boolean polydactyl;
	}

	@Entity( name = "Dog" )
	@Table( name = "dogs" )
	public static class Dog extends Mammal {
		private boolean akcRecognized;
	}